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INVENTOR H I 5 ATTORNEY? Patented Aug. 3,1897.

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S ALLEY STEAM BOILER.

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S. AL I STEAM B R.. No. 587,667. Patented Aug. 3,1897.

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WITNESSES UNITED STATES PATENT ()rrrcn.

STEPHEN ALLEY, OF GLASGOIV, SCOTLAND.

STEAM-BOILER.

SPECIFICATION forming part of Letters Patent No. 587,667, dated August3, 1897. Application filed June 5, 1897. Serial No. 639,541. (No model.)Patented in England February 13,1896,N0. 3,278.

To all whom it may concern:

Be-it known that I, STEPHEN ALLEY, a subj ect of the Queen of GreatBritain and Ireland, and a resident of Glasgow, Scotland, have inventedcertain Improvements in and Connected with Steam-Boilers, (for which Ihave obtained British Patent No. 3,273, dated February 13, 1896,) ofwhich the following is a description.

My said invention comprises an improved construction of steam-boilersuitable for high or other pressures, and which, while securingefficiency, has compactness with accessibility of all parts and otheradvantages.

Two modifications of boilers as made according to my invention are shownon three accompanying sheets of explanatory drawings, Figures 1 and 2,on Sheet 1 thereof, being, respectively, a front and a side elevation ofone modification, and Figs. 3 and 4, on Sheet 2, being, respectively, atransverse vertical section and a longitudinal vertical section of thesame. Fig. 5, on Sheet 3, is a transverse vertical section of a secondmodification and Figs. 6 and 7 are views, at right angles to each other,of details of the same;

In the drawings the same reference-letters are used to mark the same orlike parts wherever they are repeated.

The modification of my improved boiler shown in Figs. 1, 2, 3, and 4 ofthe drawings comprises a number of sections of a vertical fiat form,each section consisting of a rectangular arrangement having two headerorend pipes A, connected by numerous tubes B, and being placed with onediagonal vertical. Two sets of the sections are combined in the boilerwith their horizontal diagonals in the same horizontal plane, andpresent angular spaces F and C above and below, in the latter of whichthe furnace G is placed. The tubes B in each set or wing are placedparallel to the outer lower side and the inner upper side of therectangle, or they mightbe placed at right angles to those sides. In allcases, however, all the tubes 13 of a set of sections are paralleltoeach other,while the tubes of one section are placed opposite the spacesbetween the tubes ofthe adjacent sections.

furnace 0 pass from the inner end in two streams from back to frontthrough and among The fire-gases from the the tubes 13 of the two setsof sections, and from the front enter the space F in the upper anglebetween the two sets of sections, where they act on two (or it might beone or more than two) steam-drums D on their way to the uptake E. Thegases are compelled to take the course described by brick or otherpartitions G, suitably arranged. More than two of the sets of sectionsmay be arranged in a horizontal row, with furnaces in the lower angularspaces between the sets.

The tubes B are necting pipes A, which are preferably of approximatelysquare section, by being expanded in holes in the pipes, external holesbeing formed to admit the expanding-tool,

and being closed by screw-plugs,'which are made recessed or hollow, whenin positions in which they are exposed to strong heat. The upper headeror connecting pipes A are sepa rately connected to the steam-drums D,and the lower header or connecting pipes are separately connected tobottom water-drums J, so that each section of tubes can be detachedwhile leaving the other sections untouched. The downward flow of thewater is provided for by externalpipes K, connecting the steam-' drums'D with the bottom water-drums J. The stean1drums D are-connected byshort pipes L, which also act as distance-pieces. A metal casing Hincloses the parts, and it is provided with doors N for each set ofsections for the purposes of examining or cleaning the tubes.

The modification of my improved boiler shown in Figs. 5, 6, and 7comprises an improved mode of fixing the header-pipes A to thesteam-drums D and water-drums J. In this case stools or jointconnect-ions P, shown as being interposed between the header-pipes A anddrums D and J in Figs. 1, 2, 3, and at, are dispensed with and theheader-pipes are fixed directly to the drums. Facings Q are formed onthe drums, and the header-pipes A, which are square in section, arefixed to them by stud-bolts R, which pass through distance tubes orpieces S within the header-pipes for strengthening purposes. Theheader-pipes A are blind at both ends, comm unication with the drums Dand J being effected through lateral openings T. The other parts of thisfixed to the header or conmodification are constructed and arrangedsimilarly to the corresponding parts of the modification previouslydescribed.

YVhat I claim is A steam-boiler comprising two or more sets ofrectangular sections or elements, each set of sections being constructedwith watertubes all parallel to each other and arranged,

each with one diagonal vertical, and the sets of sections presentingbetween them upper and lower angular spaces, respectively for the l Vitn esses WILLIAM HASTIE, GEORGE PATTERSON.

